Phil Jones Bass PJB DOUBLE FOUR Owner's Manual page 8

Unfortunately for bass players, low frequencies are always very difficult to control with
room acoustics. The reproduced wavelengths of the notes you are playing often correspond
to the room dimensions, in which case the reflected sound off the walls interferes with the
sound from the speaker as you get further away from it.
Getting the most from your DOUBLE FOUR
It is important to understand that this is a very different amplifier from conventional
analog amp. The controls send information to two internal micro computers: one for
the pre amp and the second for the power amp. This information is processed as EQ
changes or level changes so it takes a very small amount of time for the computers to
act on changes to EQ and volume controls. This is known as latency and if you
change a control while playing simultaneously, you will notice a very slight delay as
the changes are processed. It is simply the characteristic of the processers and not a
fault on the unit.
All amplifiers will be affected by the room they are in and in fact it can make a huge
difference to the sound where you place your amplifier. If you place the amp on a table far
from any wall, this will give you the least bass (low frequency) output. Walls, Floor and
Ceiling act like a mirror to the amplifier because the sound wave is reflected back and it
will magnify the sound. So placing the unit on a floor and close to a room corner will give
you the most bass output. You should experiment to see the best placement for your sound.
Speakers are a bit like shoes, new ones are never as comfortable as worn in older ones and
in time speakers will "soften" up. The sound will be warmer and fuller in time and a break
in period of playing is required to get the amp to perform its best. This can also be done just
by playing music through the aux input instead of playing.
TRANSPORTING AND STORING THE DOUBLE FOUR
When transporting in a vehicle, it is recommended that you use an external case or heavy-duty
cover to prevent it being damaged by falling over or other objects falling on it.
When Storing:
· Keep in a dry location preferably at room temperature.
· Do not store in temperatures below -20 Degrees C or above 40 Degrees C.
· Do not allow it to get wet. If this occurs,never turn it on in this condition.
· Do not leave the DOUBLE FOUR permanently connected to a power source.
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